2.9BSD - /usr/src/lib/c/sys/write.s

   1: / error = write(fildes, buffer, nbytes);
   2: /	  char *buffer;
   3: /	  unsigned nbytes;
   4: 
   5: .globl  _write
   6: .globl  cerror
   7: 
   8: _write:
   9:         mov     r5,-(sp)
  10:         mov     sp,r5
  11:         mov     4(r5),r0
  12:         mov     6(r5),0f
  13:         mov     8(r5),0f+2
  14:         sys     0; 9f
  15:         bec     1f
  16:         jmp     cerror
  17: 1:
  18:         mov     (sp)+,r5
  19:         rts     pc
  20: .data
  21: 9:
  22:         sys     write; 0:..; ..

Defined functions